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Author Bhadra, S. ♦ Bridges, G.E. ♦ Thomson, D.J. ♦ Freund, M.S.
Source IEEE Xplore Digital Library
Content type Text
Publisher Institute of Electrical and Electronics Engineers, Inc. (IEEE)
File Format PDF
Copyright Year ©2010
Language English
Subject Domain (in DDC) Technology ♦ Engineering & allied operations ♦ Applied physics
Subject Keyword Coils ♦ Resonant frequency ♦ Electrodes ♦ Impedance ♦ Sensors ♦ Wireless sensor networks ♦ Electric potential
Abstract We present a wireless coupled-coil passive pH sensor for high-resolution remote pH monitoring. The sensor is based on a passive LC coil resonator whose resonant frequency is monitored remotely by measuring the impedance of an interrogator coil coupled to the sensor coil. The sensor consists of an inductive coil connected in parallel with a varactor (voltage dependent capacitor) and a pH combination electrode. When the pH of the contact solution changes, the electrode potential changes the capacitance, and therefore the resonant frequency of the sensor. A linear response over a 4 to 10 pH dynamic range and 50 kHz/pH sensitivity are achieved with a 0.1 pH resolution. The sensor has a response time of less than 30 sec.
Description Author affiliation: Department of Electrical and Computer Engineering, University of Manitoba, Winnipeg, Canada (Bhadra, S.; Bridges, G.E.; Thomson, D.J.; Freund, M.S.)
ISBN 9781424481705
ISSN 19300395
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research ♦ Reading
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2010-11-01
Publisher Place USA
Rights Holder Institute of Electrical and Electronics Engineers, Inc. (IEEE)
e-ISBN 9781424481699
Size (in Bytes) 967.04 kB
Page Count 4
Starting Page 927
Ending Page 930


Source: IEEE Xplore Digital Library